| 摘要 |
PROBLEM TO BE SOLVED: To provide an overhead valve engine having improved lubricating performance between a valve cam and a tappet. SOLUTION: In the overhead valve engine, a tappet guide hole 6 is provided downward from a bottom wall 5 of a push rod insertion chamber 4, the valve cam 7 is arranged on the lower side of the tappet guide hole 6 for guiding the tappet 8 placed on the valve cam 7 so as to be moved up and down via the tappet guide hole 6, a push rod 9 placed on the tappet 8 is serially inserted into the push rod insertion chamber 4 and a push rod insertion hole 2, and an oil flow-out hole 11 is provided in a range from the bottom wall 5 of the push rod insertion chamber 4 into a crank case 10. An outlet 11a of the oil flow-out hole 11 is opened to the upper side of the cam face of the valve cam 7 so that oil 12 flowing out of the outlet 11a of the oil flow-out hole 11 falls on the cam face of the valve cam 7. COPYRIGHT: (C)2006,JPO&NCIPI
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